EP1185369B1 - Refining element - Google Patents

Refining element Download PDF

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Publication number
EP1185369B1
EP1185369B1 EP00921196A EP00921196A EP1185369B1 EP 1185369 B1 EP1185369 B1 EP 1185369B1 EP 00921196 A EP00921196 A EP 00921196A EP 00921196 A EP00921196 A EP 00921196A EP 1185369 B1 EP1185369 B1 EP 1185369B1
Authority
EP
European Patent Office
Prior art keywords
bars
refining element
refining
bar
refiner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00921196A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1185369A1 (en
Inventor
Nils Virving
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Valmet Fibertech AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Fibertech AB filed Critical Valmet Fibertech AB
Publication of EP1185369A1 publication Critical patent/EP1185369A1/en
Application granted granted Critical
Publication of EP1185369B1 publication Critical patent/EP1185369B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs

Definitions

  • This invention relates to refiners of disc-type with opposed refining discs rotating relative to each other.
  • the refining discs are provided with refining elements, which between themselves form a refiner gap with a refiner zone for the working of fibrous material.
  • the fibrous material preferably is lignocellulosic fiber material, and the refiner is used for manufacturing, for example, reject pulp, recycled fiber pulp and mechanical pulps such as board pulp, thermomechanical pulp (TMP) and chemi-thermomechanical pulp (CTMP) as well as chemical pulps.
  • the invention more precisely, relates to a refining element for use in a refiner of the aforesaid type.
  • a refining element is designed with a pattern of bars and intermediate grooves.
  • the bars and grooves are formed in different ways, depending on the fibrous material to be worked and on the degree of working and thereby, in the case of lignocellulosic material, on the pulp quality desired.
  • the bars for example, can be continuous or discontinuous and arranged in different patterns.
  • the refiner gap is designed so that the fibrous material shall pass from the inside out, seen in radial direction.
  • the refining elements normally are designed to bring about a first disintegration of the material and to advance the material further outward in the refiner gap.
  • a certain defibration i.e. separation of the fibers of the lignocellulosic material, also takes place in the inner portion of the refiner gap where the distance between the refining surfaces is greatest. Thereafter the distance decreases outward for achieving the desired working of the fibrous material.
  • the working of the fibrous material is carried out substantially by the bars of the refining elements. Their design, thus, is of essential importance for the pulp quality. Other factors of influence on the pulp quality are, for example, the size of the refiner gap, the liquid contents in the fibrous material, the feed, temperature etc.
  • the bars have an upper surface with edges. At the working of the fibrous material the bars are worn, especially their edges, which thereby get round. In cases where one refiner disc is stationary, its bars most often get worn most, because the difference in speed between the fibrous material and stationary refiner disc is greater than the difference in speed between the fibrous material and rotating refiner discs.
  • the wear is caused above all by the fact that sand and other hard foreign particles follow along with the fibrous material into the refiner and, thus, into the refiner gap where they repeatedly come into contact with the bars of the refining elements.
  • the refiner discs normally have a rotation speed of up to 3000 revolutions per minute relative to each other, and the refiner gap normally has a size of about 0.2 to 2 mm. Foreign hard particles with a diameter greater than the refiner gap thereby can cause great damage on the refining elements, but also small particles subject the refining elements to wear.
  • US 5 467 931 discloses a refining element with bars and grooves.
  • Each bar has an upwardly sloping uppermost surface, which forms a cutting edge (54, 66) with a leading side (56, 68) and a trailing side.
  • the bars are widening stepwise on the trailing side of the bar such that a bulb is formed.
  • the problem of keeping the edge sharp is solved by tapered bars, which "tend to wear sharp".
  • the present invention offers another solution of the aforesaid problems. According to the invention it is, thus, possible to use refining elements for a longer time without increased energy demand and with maintained pulp quality.
  • By forming at least one step in the upper surfaces of the bars at least two longitudinal edges located at different heights on the bars are formed. This means that initially the uppermost edge is active and subjected to wear. As the uppermost edge gradually gets worn, the edge work is taken over by the bar edge located nearest downward on the step.
  • the service life for the refining element can be extended substantially.
  • the steps can extend, for example, along the entire length of the bars or be broken by small portions without step in the longitudinal direction of the bars.
  • Each step can have along the bars a constant or varying depth into the upper surfaces of the bars.
  • the steps can be formed on only one or on both sides of the bars. Preferably a single step is provided on a bar, but in certain cases two or more steps can be formed.
  • a refining element 10 is shown, which is provided with a pattern of bars 11 and intermediate grooves 12, where the bars have upper surfaces 13 with edges 14.
  • the pattern is divided into two zones, an inner one 15 and an outer one 16.
  • the bars and grooves in the inner zone are coarser than in the outer zone.
  • the bars in the inner zone are intended to bring about a first disentegration of the material and to advance the material outward to the outer zone.
  • the bars in the outer zone are arranged more densely, which implies more bar edges for effecting the substantial defibration and working of the material.
  • the pattern can also comprise more zones, in which case the pattern usually is made more dense from one zone to another, radially outward.
  • a step 17 extends which is located downwardly of the upper surface 13 of the bar.
  • the difference in level shall be one or some mm, preferably 2-5 mm.
  • two longitudinal edges located on different heights are formed, viz. the edge 14 on the upper surface of the bar and the edge 18 on the step 17.
  • the step 17 has a constant depth into the bar, but along the bar is broken by small portions 19 without step, in order to improve the strength of the bar 11.
  • the transition from the step 17 to the level located above on the bar suitably is rounded, as appears from Fig. 6 , in order to give optimum strength to the bar.
  • Fig. 3 another embodiment of the bar is shown. It differs from Fig. 2 in that the step 20 has a varying depth along the bar into the upper surface 13 of the bar.
  • Fig. 4 an embodiment with steps 21 on both sides of the bar 11 is shown. This implies that a refining element with such bars can rotate in both directions.
  • Figs. 5 and 7 another alternative of a bar with two steps 22, 23 on different levels is shown, where on the bar an additional edge 24 on the lowest step 23 is formed. It is, of course, furthermore possible to combine the shown embodiment of bars in a suitable way on a refining element.
  • Bars designed according to the invention can be arranged in any zone on the refining element, but preferably in an outer zone where the defibration and working is most intensive, and the distance between opposed refining elements is shortest, i.e. the refiner gap is smallest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP00921196A 1999-03-19 2000-03-03 Refining element Expired - Lifetime EP1185369B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9901020A SE513807C2 (sv) 1999-03-19 1999-03-19 Malelement avsett för malapparater av skivtyp för bearbetning av fibermaterial
SE9901020 1999-03-19
PCT/SE2000/000420 WO2000056459A1 (en) 1999-03-19 2000-03-03 Refining element

Publications (2)

Publication Number Publication Date
EP1185369A1 EP1185369A1 (en) 2002-03-13
EP1185369B1 true EP1185369B1 (en) 2008-12-10

Family

ID=20414936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00921196A Expired - Lifetime EP1185369B1 (en) 1999-03-19 2000-03-03 Refining element

Country Status (14)

Country Link
US (1) US6592062B1 (zh)
EP (1) EP1185369B1 (zh)
JP (1) JP2002540298A (zh)
CN (1) CN1207100C (zh)
AT (1) ATE416842T1 (zh)
AU (1) AU760157B2 (zh)
BR (1) BR0009123A (zh)
CA (1) CA2362667C (zh)
DE (1) DE60041057D1 (zh)
ES (1) ES2313890T3 (zh)
NO (1) NO323918B1 (zh)
NZ (1) NZ513997A (zh)
SE (1) SE513807C2 (zh)
WO (1) WO2000056459A1 (zh)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI118971B (fi) * 2002-07-02 2008-05-30 Metso Paper Inc Jauhin
SE526198C2 (sv) * 2003-05-23 2005-07-26 Metso Paper Inc Malelement för malapparater av skivtyp för bearbetning av fibermaterial
SE525980C2 (sv) * 2003-10-06 2005-06-07 Metso Paper Inc Malelement
SE526401C2 (sv) * 2004-01-21 2005-09-06 Metso Paper Inc Malelement
US7172148B2 (en) * 2004-02-05 2007-02-06 Andritz Inc. Grooved pyramid disperger plate
CA3022730C (en) * 2007-02-08 2021-03-30 Andritz Inc. Mechanical pulping refiner plate having curved refining bars with jagged leading sidewalls and method for designing plates
US20080303033A1 (en) 2007-06-05 2008-12-11 Cree, Inc. Formation of nitride-based optoelectronic and electronic device structures on lattice-matched substrates
US8042755B2 (en) 2008-01-07 2011-10-25 Andritz Inc. Bar and groove pattern for a refiner plate and method for compression refining
US9708765B2 (en) 2011-07-13 2017-07-18 Andritz Inc. Rotor refiner plate element for counter-rotating refiner having curved bars and serrated leading edges
US9670615B2 (en) 2011-08-19 2017-06-06 Andritz Inc. Conical rotor refiner plate element for counter-rotating refiner having curved bars and serrated leading sidewalls
FI125608B (en) * 2012-05-15 2015-12-15 Valmet Technologies Inc Blade element
US9181654B2 (en) 2012-05-30 2015-11-10 Andritz Inc. Refiner plate having a smooth, wave-like groove and related methods
US9604221B2 (en) * 2012-11-09 2017-03-28 Andrtiz Inc. Stator refiner plate element having curved bars and serrated leading edges
DE102013114699A1 (de) * 2013-12-20 2015-06-25 Cvp Clean Value Plastics Gmbh Vorrichtung zum Entfernen von Verunreinigungen auf Kunststoffschnipseln
US11141735B2 (en) 2017-06-05 2021-10-12 Valmet Technologies Oy Refiner plate with wave-like groove profile
SE541499C2 (en) * 2017-12-01 2019-10-22 Valmet Oy Refining plate provided with refining bars having edge creating bar cavities
US11001968B2 (en) 2018-01-02 2021-05-11 International Paper Company Apparatus and method for processing wood fibers
US10794003B2 (en) 2018-01-02 2020-10-06 International Paper Company Apparatus and method for processing wood fibers
US11421382B2 (en) 2018-01-02 2022-08-23 International Paper Company Apparatus and method for processing wood fibers
SE542690C2 (en) * 2018-07-25 2020-06-30 Valmet Oy Refiner segment with varying depth profile
US11643779B2 (en) * 2019-12-13 2023-05-09 Andritz Inc. Refiner plate having grooves imparting rotational flow to feed material
CN114438810B (zh) * 2022-01-24 2023-12-29 丹东鸭绿江磨片有限公司 一种具有狭管齿型的磨片或磨盘及磨浆机

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1207572A (en) * 1985-06-06 1986-07-15 William C. Leith Rotating disc wood chip refiner
US4767065A (en) * 1987-01-12 1988-08-30 Jjw, Inc. Material pulverizing apparatus
US5046672A (en) * 1990-08-31 1991-09-10 Beloit Corporation Refiner plate groove configuration
US5181664A (en) 1992-04-17 1993-01-26 Andritz Sprout-Bauer, Inc. Grinding plate with angled outer bars
US5467937A (en) * 1993-11-15 1995-11-21 Sandar Industries, Inc. Track assembly for a cutting tape
US5467931A (en) * 1994-02-22 1995-11-21 Beloit Technologies, Inc. Long life refiner disc
SE502906C2 (sv) * 1994-06-29 1996-02-19 Sunds Defibrator Ind Ab Malelement
US5690286A (en) * 1995-09-27 1997-11-25 Beloit Technologies, Inc. Refiner disc with localized surface roughness
ES2170287T3 (es) 1995-12-21 2002-08-01 Valmet Fibertech Ab Elemento de refinacion.
SE508502C2 (sv) 1997-02-25 1998-10-12 Sunds Defibrator Ind Ab Matningselement för malapparat med två motstående malorgan, av vilka ett är stationärt och ett roterande
SE511419C2 (sv) 1997-09-18 1999-09-27 Sunds Defibrator Ind Ab Malskiva för en skivraffinör

Also Published As

Publication number Publication date
BR0009123A (pt) 2001-12-18
US6592062B1 (en) 2003-07-15
ES2313890T3 (es) 2009-03-16
EP1185369A1 (en) 2002-03-13
NO323918B1 (no) 2007-07-23
WO2000056459A1 (en) 2000-09-28
CN1207100C (zh) 2005-06-22
SE513807C2 (sv) 2000-11-06
NZ513997A (en) 2003-03-28
AU4154000A (en) 2000-10-09
NO20014525D0 (no) 2001-09-18
SE9901020L (sv) 2000-09-20
SE9901020D0 (sv) 1999-03-19
NO20014525L (no) 2001-11-15
ATE416842T1 (de) 2008-12-15
AU760157B2 (en) 2003-05-08
JP2002540298A (ja) 2002-11-26
CA2362667A1 (en) 2000-09-28
DE60041057D1 (de) 2009-01-22
CN1344181A (zh) 2002-04-10
CA2362667C (en) 2008-01-22

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